Fastener



May 30, 1933- H. ROSENBERG .1.9129099 FASTENER original Fiied June 4, 1928 FI E E..

mntoz HEYMAN RUSENB,

Patented May 30, 1933 UNET E D SAT ii S istante HEYMAN ROSENBERG, 0E NEWiYORK, N. Y.

FASTENER 4 @riginal application iled June 4, .1928, Serial No. 282,732, Patent No. 1,844,823, dated February 9, 1932.

Divided and this application 1'i1ed 5 metal together independently of any such with.

support, this application being a division of my co-pending application Serial No. 282,782, led June 4, 1928, now Patent No. 1,844,823, dated February 9th, 1982.

ln my `Patent No. 1,411,184, dated March 28, 1922, is set forth an art or process characterized by the forming of a cylindrical opening in sheets of'metal and the insertion Vof a hardened thread screw in such lcylindrical opening, the opening being substantially equal to the diameter of the main body of the screw, and the screw having a tapering entering tip to facilitate introduction of the screw. In carrying out the practice of my said patent, it has for years been customary to iirst form a cylindrical opening either by the use of such a punch as is shown in my said patent, or by the employment of a shearing punch 'or drill and afterwards introducing the screw. The present invention, however, is characterized by incorporating in a single instrumentality the punching means or tool as an integral part with the anchorage means or screw. Subsequent to my said platent, l have received various patents for fasteners and anchorage devices having threaded or lribbed anchorage means all adapted for introduction into ready-made openings in work, as, for example, my Patent No. 1,482,151, dated January 29, 1924, and particularly Figure 7, discloses a driven fastener having a tapering entering tip constructed to assist in bringing the fastener into correct alinement with the previously prepared opening. Likewise, my Patent No. 1,545,- 471, dated July 7 1925, discloses a similarly pointed entering end to aid in finding the prepared opening in the work and bringing the pilot portion into exact aliuement there In my Patent No. 1,526,182` dated February 10, 1925, is seen the pilot without the hole-finder tip, but with the thread vanishing into the body of the screw at the beginning of the pilot to facilitate draw or biting into the material by the thread, but in .Tune 17, 1930. Serial No. 461,761.

none of these nor in an structure of which l am aware has there een any attemp-t to incorporate in one and the same device the hole-making instrument and the anchoring instrument. lt is the object of the present invention to incorporate these two into one instrumentality enabling eifective application without resort to supplementing toolsy and without the inconvenience of requiring a separate tool for each different size of screw or anchorage device to be applied.

With these and further ob]ects in view as will in part hereinafter become apparent and in part be stated, the invention includes the combination of a hole-forming tool shaped and proportioned to provide a cylindrical hole in a sheet of metal and a threaded or ribbed instrument integral with said tool and following the same for effecting anchorage in the walls of the sheet metal surrounding the cylindrical opening.

The invention also comprises certain other novel constructions, combinations, and arrangements of parts as subsequently specified and claimed. 75

In the accompanying drawing,

Figure 1 is a view in side elevation of an embodiment of the present invention illustrated as in theposition in the course of formationof the cylindrical opening, the parts being seen on a scale enlarged beyond the average, normal commercial sizes.

Figure 2 is a similar view of the same illustrated in its finally seated and secured position. 8

Figure 3 is atransverse section taken on the plane indicated by line 33 of Figure 2, and looking downward.

Figure 4 is a yview similar to Figure 2 lon a reduced scale/showing a modified application of the fastener.

Referring to the drawing by numerals, 1 indicates an ordinary sheathing board or other support. for sheet metal roofing or other sheet metal 2. The sheet 2 being placed upon 95 the wooden support 1 is anchored thereto by the driving of an anchorage device through the metal sheet and into the support, said anchorage device consisting of a pin-like body provided with a smooth entering portion 3 having an entering-pointed tip 4. Be-

cause of its function, the portion 3 will be herein referred to as the shaping tool. The pin-like body outward or upward from the shaping tool 3 is formed with high pitched rolled threads 5, 5. The threads may be otherwise formed than rolled, but, as a matter of commercial practicability and inexpensiveness, the rolling of the threads 5 is preferred, because it is an important feature of the present invention that the threads outstand laterally beyond the extended lines of the cylinder forming the shaping tool. In other Words, the diameter of shaping tool 3 is considerably less than the distance from the farthest outstanding point of a given thread 5 and the farthest outstanding point of a diametrically opposite thread 5, as best seen in Figure 3. At the Outer extremity, the pin is preferably formed with an appropriate head 6, which is proportioned according to the character of work to be done, and usually assumes a relatively wide diameter for the purpose of providing a bro-ad bearing surace.

The smooth portion 3 with its penetrating point 4, comprises a shaping and finishing tool for producing a downwardly extending burr 7 from the metal 2, which burr terminates in serrated, irregular edges 8 projecting laterally into the woo-d of the support l. The burr 7 is formed into a short cylinder by the action of the finishing tool portion 3 proportioned to receive the threads 5 and to be entered by such threads preferably for a portion of the thickness of the burr, that is, the thickness of the sheet 1. The threads 5 will enter the cylindrical burr 7, as indicated at 8.', 8 in Figure 2, for a depth only equalto the distance to which each thread 5 outstands laterally beyond the extended line of the cylinder 3, but will enter to that extent and in some instances a slightly greater depth of entry will be indicated incident to a slight flowing of the metal of burr 7 along the entering threads 5 incident to the parting of the metal as the threads enter the same. Of course,'it will be understood that the threads 5 in entering the metal of the burr 7 will tend to spread the burr, but such spreading action will be resisted both by the cylindrical burr and by the compressed wood of support 1 which surrounds the burr 7. Thus, each part reacts against the other so that the three parts, the surrounding woo-d, the surrounding burr 7, and the engaging threads 5 are forced into the maximum of intimate contact when the head` 6 is driven down to a seated position on the upper face of the sheet 2, asbest seen in Figure 2. Furthermore, it will be observed that the burr 7 cannot escape from the wood 1 ,because of the presence of the threads 5 and the body or root diameter of the pin carrying threads 05 and the said threads cannot escape from the metal both because of the high frictional resistance of the metal burr 7 to any retrograde movement of the threads 5 and also because the ber of the wood will have sprung to a position overhanging the interlock or shouldered portionI 3', best seen in Figure 3, produced bv the upper terminus of the smooth portion or forming tool 3. Thus, the screw-threaded pin will be effectively held against upward or outward release even under the strain of varying temperature conditions, and the three parts consisting of thel wood, the burred sheet metal, and the pin body will thus be anchored together as a unit.

The sheet 2 ma be treated in any manner desired accor ing to common practice after the anchorage bythe present improved anchoring pin upon reaching its seated position, as indicated in Figure 2. When sheet 2 is part of a roof, one acceptable mode of connection of another sheet of metal to the sheet shown in Figure l is indicated in Figure 2 in which the fiat seam lock joint is shown as formed and flattened down`upon.

the head 6, and then further anchored by appropriate soldering 9 for preventing the possibility of leakage, and avoiding the danger of rusting of the anchoring pin.

The forming tool 3 with its tip 4 and the threads 5 are hardened sufficiently for entering metal, such as soft iron or soft steel, copper, or the like, substantially without injury to the threads or to the parts 3 and 4, as, for instance, by having the entire anchoring pin case-hardened by the cyaniding process or any other acceptable mode of casehardening. It is of importance that the threads 5 be case-hardened and also that the forming or shaping tool 3 be case-hardened in order that the burr 7 be effectively formed in the first place to snugly surround the forming tool 3, and further in order that the threads 5 may produce corresponding or female threads 8 in the .burr 7 which will be clear-cut and effective. It has been proposed in various industrial arts to effect a close contact by providing threads or.v ribs of soft metal to be'forced into driven contact with surrounding work of the same kind of metal with the result that parts are stripped from both and a fairly intimate initial contact is attained which is not suffciently close to be permanently maintained.

Of course, the pitch of the thread 5 is4 capable of variation, but it is desirable .that the pitch should be sufficiently high to enappropriate usage.

able the pin to be driven in by hammer blows delivered at the outer end of the pin and to cause the pin to rotate while being so driven, whereby the threads 5 track in the initially formed female threads 8. Obviously, this would not result if the threads 5 were of the same or less maximum diameter as the diameter of the forming tool 3.

It will be obvious that the invention is susceptible of a wide range of application additional to that illustrated in the accompanying drawing. One usage slightly vary-4 ing from that just described is shown in Figure 4 in which the parts correspond'to those above described and the same reference numerals have been applied and the same description will equally appl except that the metal sheet 2 as seen in igure 4 is in thel form of a disc or fragment resting on a sheet 2". The sheet 2 may be of impervious felt or other paper or other sheeting for use as roong or as a covering for the sheathing of a frame structure or for any other the metal sheet 2, as will be clear from Figure 4, functions thesame as above described, but in doing so must penetrate the sheet 2. Thus, the invention is well adapted for anchorage of tar paper or like roofing or paper web for any purpose.

lt is important to observe that the best anchorage obtainable with a hardened thread fastener is regularly secured by the introduction of such a fastener through a cylindrical opening, the walls of which are sufficiently contracted to engage or substantially engage the body of the Jfastener as the threads thereof enter the material of the surrounding wall.

rThe broader claims for the invention disclosed herein together with certain detailed and specific claims for a different specific embodiment of the invention are presented in my co-pending divisional application yfiled March 25th, 1933, Serial No. 662,793.

What is claimed is:

1. A fastener for sheet metal and other materials comprising a body having-an integral forming tool at its entering end portion for forming a substantially cylindrically-shaped, tubular burr of sheet metal upon penetrating a sheet of metal under the force of a hammer blow or hammer blows delivered to the fastener, said tool comprising an entering tip and a substantially cylindrical shank of a length greater than its thickness, the body having a rib extending outwardly of the tool in the general direction ofthe length of the body and outstanding laterally of the body a distance sufficient to overhang the extended lines of the cylindrical portion of the tool and being thus positioned, when the fastener is advanced beyond the engagement of the tool with a sheet of metal, to enter the material of the walls of the substantially cylindrical burr formed by the tool, and the The burr 7 formed from j body having a valley extending alongside the rib leaving the body of less diameter than the diameter of the cylindrical portion of the tool, thetool and rib being hardened sulficiently for entering metal, such as soft iron or soft steel, substantially without injury to the tool or rib.

2. A fastener as claimed in claim 1 wherein the rib spirals about the body at a pitch suijiciently high to cause the rib to enter work substantially endwise and to cause rotation of the body as the body is advanced under hammer blows into the work.

3. A fastener'for sheet metal and other material comprising a body having an integral forming tool at its entering end portion for forming a substantially cylindrically-shaped, tubular burr of sheet metal upon penetrating a sheet ofl metal under the force of a hammer blow or blows delivered to the fastener, said tool comprising a substantially cylindrical shank of substantial length relative to its thickness, the body having a plurality of ribs spaced substantially uniformly about the body and extending outward of the tool in the general direction of the length of the body and outstanding laterally of the body a distance sufficient to overhang the extended lines of the tool cylinder and being thus positioned, when the fastener is advanced beyond the engagement of the tool with the sheet of metal, to enter the material of the or so t steel, substantially without injury to A the vtool or ribs.

ln testimony whereof l atlx my signature.

HEYMAN -RO SENBERG. 

